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== Soda ==
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go snippets

golang

检查map是否为空

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if len(map) == 0 {
    ....
}

时间复杂度: O(1)
参考: How to check if a map is empty in Golang?

Preappend slice

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x = append([]int{1}, x...)

// 或
x = append(x, 0)
copy(x[1:], x)
x[0] = 1

参考：How to prepend int to slice